Quorum sensing, defined as the emergence of collective behavior triggered by a critical population size or density, is a hallmark of collective biological behavior. However, it has not yet been realized in engineered quantum or classical many-body platforms. Here, we report the theoretical prediction of quorum sensing in a nonlinear cavity magnonic system, where an increase in the number of magnonic spheres drives a transition from a static state to a collectively synchronized state. We find that this synchronized state is highly sensitive to the magnon-photon coupling strength and appears as a bandlike region in the parameter space. Importantly, the quorum sensing transition is remarkably robust against parameter heterogeneity. It persists even under large mismatches in local coupling strengths, Kerr nonlinearities, and dissipation rates. These findings establish cavity magnonic platforms as a promising setting for exploring population-size-dependent collective dynamics and significantly enhance the prospects for experimental detection. By demonstrating quorum sensing in a cavity magnonic system, our work bridges concepts from biology and condensed matter physics, opening new pathways toward applications in sensing, coherent information processing, and emergent many-body technologies.

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• Hybrid quantum systems
• Kerr effect
• Magnons
• Coupled oscillators